Timeloid

Timeloid (タイムロイド), a combination of the terminology time and Vocaloid, pertains to fanmade Vocaloids representing varying periods of time.

Depiction
Time Vocaloids have varying appearances depending on the time period of time they're based upon.

History
Time Vocaloids were first introduced on July 10, 2012 with the first official Timeloid, SeekYe, being introduced a month prior on June 14, 2012.

Timeloid on Fanloid Wiki

 * SeekYe, is a fanmade from the 1600s based on Vocaloid SeeU.
 * Murasaki Ame, is an original fanmade Vocaloid from the 1980s.

Trivia

 * SeekYe was the inspiration for Timeloid with her old-timey spin on Vocaloid SeeU.